1. 9.1 Angles By: Francisco May 26, 2006 Ms. Montilla

2. 9.1 Angles Objective: You’ll learn to classify angles. Objective: You’ll learn to classify angles.

3. Word Wise Angle: Two rays with a common endpoint form an angle. The rays and vertex are used to name an angle. Angle: Two rays with a common endpoint form an angle. The rays and vertex are used to name an angle. Vertex: A vertex of an angle is the common endpoint of the rays forming the angle. Vertex: A vertex of an angle is the common endpoint of the rays forming the angle. Degree: The most common unit of measure for angles. Degree: The most common unit of measure for angles. Right: An angle that measures 90. Right: An angle that measures 90. Straight angle: An angle is straight if it measures exactly 180. Straight angle: An angle is straight if it measures exactly 180. Acute: An angle with a measure greater than 0 and less than 90. Acute: An angle with a measure greater than 0 and less than 90. Obtuse angle: Any angle that measures greater than 90 but less than 180. Obtuse angle: Any angle that measures greater than 90 but less than 180. Supplementary: Two angles are supplementary if the sum of their measures is 180. Supplementary: Two angles are supplementary if the sum of their measures is 180. Complementary: Two angles are complementary if the sum of their measures is 90. Complementary: Two angles are complementary if the sum of their measures is 90.